This patch <http://gcc.gnu.org/ml/gcc-patches/2004-12/msg00851.html> breaks bootstrap on i686-pc-mingw32 due to the name itoa in libgfortran conflicting with MinGW runtime headers.
A patch is here <http://gcc.gnu.org/ml/gcc-patches/2004-12/msg01278.html>, awaiting approval. -- Summary: [4.0 Regression] libgfortran bootstrap fails on Windows Product: gcc Version: 4.0.0 Status: UNCONFIRMED Keywords: patch Severity: critical Priority: P2 Component: libfortran AssignedTo: aaronavay62 at aaronwl dot com ReportedBy: aaronavay62 at aaronwl dot com CC: gcc-bugs at gcc dot gnu dot org,rth at gcc dot gnu dot org GCC target triplet: i686-pc-mingw32 OtherBugsDependingO 16991,18107 nThis: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19074